[OC Gunner]

I noticed that the SW99 backstraps are checked unlike the P99 straps which have dots. Does anyone know if they are interchangeable?

 

[Chrome]

I noticed that the SW99 backstraps are checked unlike the P99 straps which have dots. Does anyone know if they are interchangeable?

Yes, however it is not a 100% fit. If you look towards the bottom of a P99 you'll see that the grip is recessed where the Walther banner is. The S&W doesn't share this indention. While the grip fits, it leaves a lip of 1/16" from the indentation. That said, I had a S&W size small on mine for a month or so while waiting for a Walther one.

Later,
Chrome...

 

[Franchise]

Anyone know if the grip from a full size p99 9mm would fit a sw99c 40sw?

 

[jlavallee]

Anyone know if the grip from a full size p99 9mm would fit a sw99c 40sw?

Compact and full size grips are very different and will not work. Just look at any photo of the two guns.